-3z+21-z=8-7

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Solution for -3z+21-z=8-7 equation:


Simplifying
-3z + 21 + -1z = 8 + -7

Reorder the terms:
21 + -3z + -1z = 8 + -7

Combine like terms: -3z + -1z = -4z
21 + -4z = 8 + -7

Combine like terms: 8 + -7 = 1
21 + -4z = 1

Solving
21 + -4z = 1

Solving for variable 'z'.

Move all terms containing z to the left, all other terms to the right.

Add '-21' to each side of the equation.
21 + -21 + -4z = 1 + -21

Combine like terms: 21 + -21 = 0
0 + -4z = 1 + -21
-4z = 1 + -21

Combine like terms: 1 + -21 = -20
-4z = -20

Divide each side by '-4'.
z = 5

Simplifying
z = 5

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